4p27d.md (483B)
1 The mind, in so far as it reasons, desires nothing 2 beyond understanding, and judges nothing to be useful to itself, 3 save such things as conduce to understanding (by the foregoing 4 Prop.). But the mind (II. xli., xliii. and note) cannot possess 5 certainty concerning anything, except in so far as it has 6 adequate ideas, or (what by II. xl. note, is the same thing) in 7 so far as it reasons. Therefore we know nothing to be good or 8 evil save such things as really conduce, &c. Q.E.D. 9 10